* {box-sizing: border-box;}

.span1 {width: 8.33%;}
.span2 {width: 16.66%;}
.span3 {width: 25%;}
.span4 {width: 33.33%;}
.span5 {width: 41.66%;}
.span6 {width: 50%;}
.span7 {width: 58.33%;}
.span8 {width: 66.66%;}
.span9 {width: 75%;}
.span10 {width: 83.33%;}
.span11 {width: 91.66%;}
.span12 {width: 100%;}

[class*="span"] {
    float: left;
    padding: 5px 15px;
}

.row:after{
    content: "";
    clear: both;
    display: block;
}

.container{
    margin: 0px 15px;
}